Xamarin iOS:如何使用标准阅读器打开pdf文件

using Foundation;
using UIKit;
using QuickLook;

public class PdfViewController : QLPreviewControllerDataSource
{
    public override nint PreviewItemCount(QLPreviewController controller)
    {
        return 1; // 设置要预览的PDF文件数量
    }

    public override IQLPreviewItem GetPreviewItem(QLPreviewController controller, nint index)
    {
        var file = NSBundle.MainBundle.PathForResource("example.pdf", null); // 替换为实际的PDF文件名
        var url = NSUrl.FromFilename(file);
        return new QLPreviewItemBundle(url, file);
    }
}

public class QLPreviewItemBundle : QLPreviewItem
{
    private NSUrl _url;
    private string _title;

    public QLPreviewItemBundle(NSUrl url, string title)
    {
        _url = url;
        _title = title;
    }

    public override NSUrl ItemUrl => _url;
    public override string ItemTitle => _title;
}

// 在需要打开PDF文件的地方调用以下代码
var pdfViewController = new PdfViewController();
var previewController = new QLPreviewController();
previewController.DataSource = pdfViewController;
NavigationController.PushViewController(previewController, true);